server/clipboard.c

   1 /*
   2  * Server-side clipboard management
   3  *
   4  * Copyright (C) 2002 Ulrich Czekalla
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "ntstatus.h"
  30 #define WIN32_NO_STATUS
  31 #include "request.h"
  32 #include "object.h"
  33 #include "file.h"
  34 #include "process.h"
  35 #include "user.h"
  36 #include "winuser.h"
  37 #include "winternl.h"
  38
  39 struct clipboard
  40 {
  41     struct object  obj;              /* object header */
  42     struct thread *open_thread;      /* thread id that has clipboard open */
  43     user_handle_t  open_win;         /* window that has clipboard open */
  44     struct thread *owner_thread;     /* thread id that owns the clipboard */
  45     user_handle_t  owner_win;        /* window that owns the clipboard data */
  46     user_handle_t  viewer;           /* first window in clipboard viewer list */
  47     unsigned int   seqno;            /* clipboard change sequence number */
  48     timeout_t      seqno_timestamp;  /* time stamp of last seqno increment */
  49 };
  50
  51 static void clipboard_dump( struct object *obj, int verbose );
  52
  53 static const struct object_ops clipboard_ops =
  54 {
  55     sizeof(struct clipboard),     /* size */
  56     clipboard_dump,               /* dump */
  57     no_get_type,                  /* get_type */
  58     no_add_queue,                 /* add_queue */
  59     NULL,                         /* remove_queue */
  60     NULL,                         /* signaled */
  61     NULL,                         /* satisfied */
  62     no_signal,                    /* signal */
  63     no_get_fd,                    /* get_fd */
  64     no_map_access,                /* map_access */
  65     default_get_sd,               /* get_sd */
  66     default_set_sd,               /* set_sd */
  67     no_lookup_name,               /* lookup_name */
  68     no_open_file,                 /* open_file */
  69     no_close_handle,              /* close_handle */
  70     no_destroy                    /* destroy */
  71 };
  72
  73
  74 #define MINUPDATELAPSE (2 * TICKS_PER_SEC)
  75
  76 /* dump a clipboard object */
  77 static void clipboard_dump( struct object *obj, int verbose )
  78 {
  79     struct clipboard *clipboard = (struct clipboard *)obj;
  80
  81     fprintf( stderr, "Clipboard open_thread=%p open_win=%08x owner_thread=%p owner_win=%08x viewer=%08x seq=%u\n",
  82              clipboard->open_thread, clipboard->open_win, clipboard->owner_thread,
  83              clipboard->owner_win, clipboard->viewer, clipboard->seqno );
  84 }
  85
  86 /* retrieve the clipboard info for the current process, allocating it if needed */
  87 static struct clipboard *get_process_clipboard(void)
  88 {
  89     struct clipboard *clipboard;
  90     struct winstation *winstation = get_process_winstation( current->process, WINSTA_ACCESSCLIPBOARD );
  91
  92     if (!winstation) return NULL;
  93
  94     if (!(clipboard = winstation->clipboard))
  95     {
  96         if ((clipboard = alloc_object( &clipboard_ops )))
  97         {
  98             clipboard->open_thread = NULL;
  99             clipboard->open_win = 0;
 100             clipboard->owner_thread = NULL;
 101             clipboard->owner_win = 0;
 102             clipboard->viewer = 0;
 103             clipboard->seqno = 0;
 104             clipboard->seqno_timestamp = 0;
 105             winstation->clipboard = clipboard;
 106         }
 107     }
 108     release_object( winstation );
 109     return clipboard;
 110 }
 111
 112
 113 /* Called when thread terminates to allow release of clipboard */
 114 void cleanup_clipboard_thread(struct thread *thread)
 115 {
 116     struct clipboard *clipboard;
 117     struct winstation *winstation;
 118
 119     if (!thread->process->winstation) return;
 120     if (!(winstation = get_process_winstation( thread->process, WINSTA_ACCESSCLIPBOARD ))) return;
 121
 122     if ((clipboard = winstation->clipboard))
 123     {
 124         if (thread == clipboard->open_thread)
 125         {
 126             clipboard->open_win = 0;
 127             clipboard->open_thread = NULL;
 128         }
 129         if (thread == clipboard->owner_thread)
 130         {
 131             clipboard->owner_win = 0;
 132             clipboard->owner_thread = NULL;
 133         }
 134     }
 135     release_object( winstation );
 136 }
 137
 138 static int open_clipboard( struct clipboard *clipboard, user_handle_t win )
 139 {
 140     win = get_user_full_handle( win );
 141     if (clipboard->open_thread && clipboard->open_win != win)
 142     {
 143         set_error(STATUS_WAS_LOCKED);
 144         return 0;
 145     }
 146     clipboard->open_win = win;
 147     clipboard->open_thread = current;
 148     return 1;
 149 }
 150
 151 static int close_clipboard( struct clipboard *clipboard )
 152 {
 153     if (clipboard->open_thread != current)
 154     {
 155         set_win32_error( ERROR_CLIPBOARD_NOT_OPEN );
 156         return 0;
 157     }
 158     clipboard->open_thread = NULL;
 159     clipboard->open_win = 0;
 160     return 1;
 161 }
 162
 163 static int release_clipboard_owner( struct clipboard *clipboard, user_handle_t win )
 164 {
 165     if ((clipboard->open_thread && clipboard->open_thread->process != current->process) ||
 166         (win && clipboard->owner_win != get_user_full_handle( win )))
 167     {
 168         set_win32_error( ERROR_CLIPBOARD_NOT_OPEN );
 169         return 0;
 170     }
 171     clipboard->owner_win = 0;
 172     clipboard->owner_thread = NULL;
 173     return 1;
 174 }
 175
 176
 177 static int get_seqno( struct clipboard *clipboard )
 178 {
 179     if (!clipboard->owner_thread && (current_time - clipboard->seqno_timestamp > MINUPDATELAPSE))
 180     {
 181         clipboard->seqno_timestamp = current_time;
 182         clipboard->seqno++;
 183     }
 184     return clipboard->seqno;
 185 }
 186
 187
 188 DECL_HANDLER(set_clipboard_info)
 189 {
 190     struct clipboard *clipboard = get_process_clipboard();
 191
 192     if (!clipboard) return;
 193
 194     reply->old_clipboard = clipboard->open_win;
 195     reply->old_owner     = clipboard->owner_win;
 196     reply->old_viewer    = clipboard->viewer;
 197
 198     if (req->flags & SET_CB_OPEN)
 199     {
 200         if (!open_clipboard( clipboard, req->clipboard )) return;
 201     }
 202     else if (req->flags & SET_CB_CLOSE)
 203     {
 204         if (!close_clipboard( clipboard )) return;
 205     }
 206
 207     if (req->flags & SET_CB_RELOWNER)
 208     {
 209         if (!release_clipboard_owner( clipboard, req->owner )) return;
 210     }
 211
 212     if (req->flags & SET_CB_VIEWER) clipboard->viewer = get_user_full_handle( req->viewer );
 213
 214     if (req->flags & SET_CB_SEQNO) clipboard->seqno++;
 215
 216     reply->seqno = get_seqno( clipboard );
 217
 218     if (clipboard->open_thread == current) reply->flags |= CB_OPEN;
 219     if (clipboard->owner_thread == current) reply->flags |= CB_OWNER;
 220     if (clipboard->owner_thread && clipboard->owner_thread->process == current->process)
 221         reply->flags |= CB_PROCESS;
 222 }
 223
 224
 225 /* empty the clipboard and grab ownership */
 226 DECL_HANDLER(empty_clipboard)
 227 {
 228     struct clipboard *clipboard = get_process_clipboard();
 229
 230     if (!clipboard) return;
 231
 232     if (clipboard->open_thread != current)
 233     {
 234         set_win32_error( ERROR_CLIPBOARD_NOT_OPEN );
 235         return;
 236     }
 237     clipboard->owner_win = clipboard->open_win;
 238     clipboard->owner_thread = clipboard->open_thread;
 239     clipboard->seqno++;
 240 }